x=0;
y=0;
tick=5;
temp=0;
lim=101;
figure
hold on
grid on
while temp<lim
    x=0;
    while x<temp+1
        y=temp-x;
        plot(x,y,'.');
        x=x+1;
    end
    temp=temp+tick;
end
xlabel('x')
ylabel('y')
title('示例图片')